<!DOCTYPE html>
<br xmlns="http://www.w3.org/1999/html" xmlns="http://www.w3.org/1999/html">
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
    <link rel="stylesheet" href="./css/button.css"/>
</head>
<br>
    <br class="btn-group">
        <button class="a btn btn-large btn-primary" type="button" >下载Bootstrap</button>
        <button class="b btn btn-large btn-primary" type="button" >下载Bootstrap</button>
        <button class="c btn btn-large btn-primary" type="button" >下载Bootstrap</button>
        <button class="d btn btn-large btn-primary" type="button" >下载Bootstrap</button>
        </br>
        <button class="e btn btn-large btn-primary" type="button" >下载Bootstrap</button>
        <button class="f btn btn-large btn-primary" type="button" >下载Bootstrap</button>
        <button class="g btn btn-large btn-primary" type="button" >下载Bootstrap</button>
        <button class="h btn btn-large btn-primary" type="button" >下载Bootstrap</button>
        </br>
        <button class="i btn btn-large btn-primary" type="button" >下载Bootstrap</button>
        <button class="j btn btn-large btn-primary" type="button" >下载Bootstrap</button>
        <button class="k btn btn-large btn-primary" type="button" >下载Bootstrap</button>
        <button class="m btn btn-large btn-primary" type="button" >下载Bootstrap</button>
        </br>
        <button class="l btn btn-large btn-primary" type="button" >下载Bootstrap</button>
        <button class="n btn btn-large btn-primary" type="button" >下载Bootstrap</button>
        <button class="o btn btn-large btn-primary" type="button" >下载Bootstrap</button>
        <button class="p btn btn-large btn-primary" type="button" >下载Bootstrap</button>
    </div>


</body>
</html>